[Cython] Speed up cython for enum declarations

[Stefan Behnel]

David Cournapeau wrote:
> On Wed, Dec 3, 2008 at 5:58 PM, Robert Bradshaw wrote:
>> Actually, the parsing takes up a significant amount of the compile time.
>
> Is it because the parser cannot assume there is only declarations, or
> is parsing declarations is inherently slow ?

Parsing is slow. That's why we switched to C-compiling the parser.


>> Yes and no. This is something I've tried to do before, and still want
>> to do. One difficulty is handling dependancies between pxd files, for
>> example if a typedef or cdef class changes in one, then everything
>> that cimports and uses it changes.
>
> I don't understand: how is this a cython problem ? This should be
> handled by your build tool, no ?

Only Cython can know the inter-dependencies of .pxd, .pxi and .pyx files,
which are based on cimports and includes in the source. Look out for .dep
files in your source directory after the generation.

Stefan